Evaluation of complex multi-physics phenomena at gas diffusion electrodes during high-pressure water electrolysis with AEMs
Abstract The alkaline water electrolysis is a well-established process for producing green hydrogen from renewable energy sources. With up-to-dateAEM electrolyzers, electrochemical gas compression can be realized with water electrolysis and ion pumping membranes, to avoid costly mechanical compressi...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-07-01
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| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-05216-5 |
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| Summary: | Abstract The alkaline water electrolysis is a well-established process for producing green hydrogen from renewable energy sources. With up-to-dateAEM electrolyzers, electrochemical gas compression can be realized with water electrolysis and ion pumping membranes, to avoid costly mechanical compression. In this experimental study, we researched an electrolyzer cell with a strong metal structure, for internal pressure difference of up to 100 bar. Micro-porous gas diffusion electrodes containing non-precious nickel catalysts as well as different separators, alkaline membranes and AEMs have been investigated in the range of 300 to 800 mA cm− 2. For one preferred AEM, characteristics are shown for hydrogen pressures between 20 and 80 bars, while the anode remains at ambient 1 bar. Impedance spectroscopy diagrams are used to display the individual cell components: the ohmic resistance of the AEM and the complex impedances of both electrodes. Therewith, we could visualize the complex multi-physics phenomena and show that the oxygen electrode works as a Wartburg-element, especially due to higher diffusion rates and therewith entropy production during bubble formation. |
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| ISSN: | 2045-2322 |